140 to 145 intake, 150 to 160 or 165 on the exhaust, and transfers about 20 less than the exhaust have been working pretty well for me on the Homelite and Echo/Kioritz engines I've done. The higher numbers are used with slightly smaller props and higher rpms, and the lower numbers for swinging slightly larger props for scale applications. If you are going to run a tuned pipe, then the exhaust numbers get into the 170's.

AV8TOR